Periods post mc - how long to get back to a normal cycle?

Hello ladies,Wondering if anyone can help. I had a miscarriage a couple of months ago, got my first period just after 4 weeks post d&c and now still waiting for my second. I am now 5 days late from my normal cycle but have done a test and it was negative. I used to be on a 28 day cycle like clockwork. How long did it take any of you to get back to normal patterns? Thanks